Subtitled A Rustbowl Fantasy, this very agreeable and funny low-budget documentary by Tony Buba, set in a steel-mill town just outside Pittsburgh, follows the decline of the area as the mills shut down, as well as Buba’s own 15-year activity as a local independent filmmaker. Concerned with union organizing, his temperamental and eccentric star “Sweet Sal” Carullo, his dwindling finances, and his own soul, Buba has a lot of interesting things to say and show, and this witty and intelligent portrait of him and his community has charm to spare. (Film Center, Art Institute, Columbus Drive at Jackson, Saturday, March 18, 4:00 and 7:45, 443-3737)